[oe] How to use two toolchains

[Changhyeok Bae]

Hi

I would like to use 64 bit for kernel and 32 bit for userspace(rootfs).
Toolchain is created by OE (Not prebuilt toolchain)
Could you recommend good way to use different toolchains to achieve my goal?
If you have good examples, it's very helpful to me.

Thanks
Changhyeok